libata-link: linkify PHY-related functions

Make the following PHY-related functions to deal with ata_link instead
of ata_port.

* sata_print_link_status()
* sata_down_spd_limit()
* ata_set_sata_spd_limit() and friends
* sata_link_debounce/resume()
* sata_scr_valid/read/write/write_flush()
* ata_link_on/offline()

This patch introduces no behavior change.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

11 files changed, 177 insertions, 161 deletions

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index c72fa468a697..6e5f69a3a0c2 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1052,7 +1052,7 @@ static int ahci_do_softreset(struct ata_port *ap, unsigned int *class,
 
         DPRINTK("ENTER\n");
 
-        if (ata_port_offline(ap)) {
+        if (ata_link_offline(&ap->link)) {
                 DPRINTK("PHY reports no device\n");
                 *class = ATA_DEV_NONE;
                 return 0;
@@ -1140,7 +1140,7 @@ static int ahci_hardreset(struct ata_port *ap, unsigned int *class,
 
         ahci_start_engine(ap);
 
-        if (rc == 0 && ata_port_online(ap))
+        if (rc == 0 && ata_link_online(&ap->link))
                 *class = ahci_dev_classify(ap);
         if (*class == ATA_DEV_UNKNOWN)
                 *class = ATA_DEV_NONE;
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index f30c4771b3af..6f99dee6b6d2 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2201,7 +2201,7 @@ int ata_bus_probe(struct ata_port *ap)
                         /* This is the last chance, better to slow
                          * down than lose it.
                          */
-                        sata_down_spd_limit(ap);
+                        sata_down_spd_limit(&ap->link);
                         ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
                 }
         }
@@ -2230,28 +2230,28 @@ void ata_port_probe(struct ata_port *ap)
 
 /**
  *      sata_print_link_status - Print SATA link status
- *      @ap: SATA port to printk link status about
+ *      @link: SATA link to printk link status about
  *
  *      This function prints link speed and status of a SATA link.
  *
  *      LOCKING:
  *      None.
  */
-void sata_print_link_status(struct ata_port *ap)
+void sata_print_link_status(struct ata_link *link)
 {
         u32 sstatus, scontrol, tmp;
 
-        if (sata_scr_read(ap, SCR_STATUS, &sstatus))
+        if (sata_scr_read(link, SCR_STATUS, &sstatus))
                 return;
-        sata_scr_read(ap, SCR_CONTROL, &scontrol);
+        sata_scr_read(link, SCR_CONTROL, &scontrol);
 
-        if (ata_port_online(ap)) {
+        if (ata_link_online(link)) {
                 tmp = (sstatus >> 4) & 0xf;
-                ata_port_printk(ap, KERN_INFO,
+                ata_link_printk(link, KERN_INFO,
                                 "SATA link up %s (SStatus %X SControl %X)\n",
                                 sata_spd_string(tmp), sstatus, scontrol);
         } else {
-                ata_port_printk(ap, KERN_INFO,
+                ata_link_printk(link, KERN_INFO,
                                 "SATA link down (SStatus %X SControl %X)\n",
                                 sstatus, scontrol);
         }
@@ -2271,32 +2271,33 @@ void sata_print_link_status(struct ata_port *ap)
  */
 void __sata_phy_reset(struct ata_port *ap)
 {
-        u32 sstatus;
+        struct ata_link *link = &ap->link;
         unsigned long timeout = jiffies + (HZ * 5);
+        u32 sstatus;
 
         if (ap->flags & ATA_FLAG_SATA_RESET) {
                 /* issue phy wake/reset */
-                sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
+                sata_scr_write_flush(link, SCR_CONTROL, 0x301);
                 /* Couldn't find anything in SATA I/II specs, but
                  * AHCI-1.1 10.4.2 says at least 1 ms. */
                 mdelay(1);
         }
         /* phy wake/clear reset */
-        sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
+        sata_scr_write_flush(link, SCR_CONTROL, 0x300);
 
         /* wait for phy to become ready, if necessary */
         do {
                 msleep(200);
-                sata_scr_read(ap, SCR_STATUS, &sstatus);
+                sata_scr_read(link, SCR_STATUS, &sstatus);
                 if ((sstatus & 0xf) != 1)
                         break;
         } while (time_before(jiffies, timeout));
 
         /* print link status */
-        sata_print_link_status(ap);
+        sata_print_link_status(link);
 
         /* TODO: phy layer with polling, timeouts, etc. */
-        if (!ata_port_offline(ap))
+        if (!ata_link_offline(link))
                 ata_port_probe(ap);
         else
                 ata_port_disable(ap);
@@ -2370,9 +2371,9 @@ void ata_port_disable(struct ata_port *ap)
 
 /**
  *      sata_down_spd_limit - adjust SATA spd limit downward
- *      @ap: Port to adjust SATA spd limit for
+ *      @link: Link to adjust SATA spd limit for
  *
- *      Adjust SATA spd limit of @ap downward.  Note that this
+ *      Adjust SATA spd limit of @link downward.  Note that this
  *      function only adjusts the limit.  The change must be applied
  *      using sata_set_spd().
  *
@@ -2382,24 +2383,24 @@ void ata_port_disable(struct ata_port *ap)
  *      RETURNS:
  *      0 on success, negative errno on failure
  */
-int sata_down_spd_limit(struct ata_port *ap)
+int sata_down_spd_limit(struct ata_link *link)
 {
         u32 sstatus, spd, mask;
         int rc, highbit;
 
-        if (!sata_scr_valid(ap))
+        if (!sata_scr_valid(link))
                 return -EOPNOTSUPP;
 
         /* If SCR can be read, use it to determine the current SPD.
-         * If not, use cached value in ap->sata_spd.
+         * If not, use cached value in link->sata_spd.
          */
-        rc = sata_scr_read(ap, SCR_STATUS, &sstatus);
+        rc = sata_scr_read(link, SCR_STATUS, &sstatus);
         if (rc == 0)
                 spd = (sstatus >> 4) & 0xf;
         else
-                spd = ap->link.sata_spd;
+                spd = link->sata_spd;
 
-        mask = ap->link.sata_spd_limit;
+        mask = link->sata_spd_limit;
         if (mask <= 1)
                 return -EINVAL;
 
@@ -2419,22 +2420,22 @@ int sata_down_spd_limit(struct ata_port *ap)
         if (!mask)
                 return -EINVAL;
 
-        ap->link.sata_spd_limit = mask;
+        link->sata_spd_limit = mask;
 
-        ata_port_printk(ap, KERN_WARNING, "limiting SATA link speed to %s\n",
+        ata_link_printk(link, KERN_WARNING, "limiting SATA link speed to %s\n",
                         sata_spd_string(fls(mask)));
 
         return 0;
 }
 
-static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
+static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
 {
         u32 spd, limit;
 
-        if (ap->link.sata_spd_limit == UINT_MAX)
+        if (link->sata_spd_limit == UINT_MAX)
                 limit = 0;
         else
-                limit = fls(ap->link.sata_spd_limit);
+                limit = fls(link->sata_spd_limit);
 
         spd = (*scontrol >> 4) & 0xf;
         *scontrol = (*scontrol & ~0xf0) | ((limit & 0xf) << 4);
@@ -2444,10 +2445,10 @@ static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
 
 /**
  *      sata_set_spd_needed - is SATA spd configuration needed
- *      @ap: Port in question
+ *      @link: Link in question
  *
  *      Test whether the spd limit in SControl matches
- *      @ap->link.sata_spd_limit.  This function is used to determine
+ *      @link->sata_spd_limit.  This function is used to determine
  *      whether hardreset is necessary to apply SATA spd
  *      configuration.
  *
@@ -2457,21 +2458,21 @@ static int __sata_set_spd_needed(struct ata_port *ap, u32 *scontrol)
  *      RETURNS:
  *      1 if SATA spd configuration is needed, 0 otherwise.
  */
-int sata_set_spd_needed(struct ata_port *ap)
+int sata_set_spd_needed(struct ata_link *link)
 {
         u32 scontrol;
 
-        if (sata_scr_read(ap, SCR_CONTROL, &scontrol))
+        if (sata_scr_read(link, SCR_CONTROL, &scontrol))
                 return 0;
 
-        return __sata_set_spd_needed(ap, &scontrol);
+        return __sata_set_spd_needed(link, &scontrol);
 }
 
 /**
  *      sata_set_spd - set SATA spd according to spd limit
- *      @ap: Port to set SATA spd for
+ *      @link: Link to set SATA spd for
  *
- *      Set SATA spd of @ap according to sata_spd_limit.
+ *      Set SATA spd of @link according to sata_spd_limit.
  *
  *      LOCKING:
  *      Inherited from caller.
@@ -2480,18 +2481,18 @@ int sata_set_spd_needed(struct ata_port *ap)
  *      0 if spd doesn't need to be changed, 1 if spd has been
  *      changed.  Negative errno if SCR registers are inaccessible.
  */
-int sata_set_spd(struct ata_port *ap)
+int sata_set_spd(struct ata_link *link)
 {
         u32 scontrol;
         int rc;
 
-        if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
+        if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
                 return rc;
 
-        if (!__sata_set_spd_needed(ap, &scontrol))
+        if (!__sata_set_spd_needed(link, &scontrol))
                 return 0;
 
-        if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
+        if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
                 return rc;
 
         return 1;
@@ -2997,7 +2998,7 @@ int ata_wait_ready(struct ata_port *ap, unsigned long deadline)
 
                 if (!(status & ATA_BUSY))
                         return 0;
-                if (!ata_port_online(ap) && status == 0xff)
+                if (!ata_link_online(&ap->link) && status == 0xff)
                         return -ENODEV;
                 if (time_after(now, deadline))
                         return -EBUSY;
@@ -3199,12 +3200,12 @@ err_out:
 }
 
 /**
- *      sata_phy_debounce - debounce SATA phy status
- *      @ap: ATA port to debounce SATA phy status for
+ *      sata_link_debounce - debounce SATA phy status
+ *      @link: ATA link to debounce SATA phy status for
  *      @params: timing parameters { interval, duratinon, timeout } in msec
  *      @deadline: deadline jiffies for the operation
  *
- *      Make sure SStatus of @ap reaches stable state, determined by
+*       Make sure SStatus of @link reaches stable state, determined by
  *      holding the same value where DET is not 1 for @duration polled
  *      every @interval, before @timeout.  Timeout constraints the
  *      beginning of the stable state.  Because DET gets stuck at 1 on
@@ -3220,8 +3221,8 @@ err_out:
  *      RETURNS:
  *      0 on success, -errno on failure.
  */
-int sata_phy_debounce(struct ata_port *ap, const unsigned long *params,
-                      unsigned long deadline)
+int sata_link_debounce(struct ata_link *link, const unsigned long *params,
+                       unsigned long deadline)
 {
         unsigned long interval_msec = params[0];
         unsigned long duration = msecs_to_jiffies(params[1]);
@@ -3233,7 +3234,7 @@ int sata_phy_debounce(struct ata_port *ap, const unsigned long *params,
         if (time_before(t, deadline))
                 deadline = t;
 
-        if ((rc = sata_scr_read(ap, SCR_STATUS, &cur)))
+        if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
                 return rc;
         cur &= 0xf;
 
@@ -3242,7 +3243,7 @@ int sata_phy_debounce(struct ata_port *ap, const unsigned long *params,
 
         while (1) {
                 msleep(interval_msec);
-                if ((rc = sata_scr_read(ap, SCR_STATUS, &cur)))
+                if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
                         return rc;
                 cur &= 0xf;
 
@@ -3268,12 +3269,12 @@ int sata_phy_debounce(struct ata_port *ap, const unsigned long *params,
 }
 
 /**
- *      sata_phy_resume - resume SATA phy
- *      @ap: ATA port to resume SATA phy for
+ *      sata_link_resume - resume SATA link
+ *      @link: ATA link to resume SATA
  *      @params: timing parameters { interval, duratinon, timeout } in msec
  *      @deadline: deadline jiffies for the operation
  *
- *      Resume SATA phy of @ap and debounce it.
+ *      Resume SATA phy @link and debounce it.
  *
  *      LOCKING:
  *      Kernel thread context (may sleep)
@@ -3281,18 +3282,18 @@ int sata_phy_debounce(struct ata_port *ap, const unsigned long *params,
  *      RETURNS:
  *      0 on success, -errno on failure.
  */
-int sata_phy_resume(struct ata_port *ap, const unsigned long *params,
-                    unsigned long deadline)
+int sata_link_resume(struct ata_link *link, const unsigned long *params,
+                     unsigned long deadline)
 {
         u32 scontrol;
         int rc;
 
-        if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
+        if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
                 return rc;
 
         scontrol = (scontrol & 0x0f0) | 0x300;
 
-        if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
+        if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
                 return rc;
 
         /* Some PHYs react badly if SStatus is pounded immediately
@@ -3300,7 +3301,7 @@ int sata_phy_resume(struct ata_port *ap, const unsigned long *params,
          */
         msleep(200);
 
-        return sata_phy_debounce(ap, params, deadline);
+        return sata_link_debounce(link, params, deadline);
 }
 
 /**
@@ -3322,7 +3323,8 @@ int sata_phy_resume(struct ata_port *ap, const unsigned long *params,
  */
 int ata_std_prereset(struct ata_port *ap, unsigned long deadline)
 {
-        struct ata_eh_context *ehc = &ap->link.eh_context;
+        struct ata_link *link = &ap->link;
+        struct ata_eh_context *ehc = &link->eh_context;
         const unsigned long *timing = sata_ehc_deb_timing(ehc);
         int rc;
 
@@ -3335,9 +3337,9 @@ int ata_std_prereset(struct ata_port *ap, unsigned long deadline)
         if (ehc->i.action & ATA_EH_HARDRESET)
                 return 0;
 
-        /* if SATA, resume phy */
+        /* if SATA, resume link */
         if (ap->flags & ATA_FLAG_SATA) {
-                rc = sata_phy_resume(ap, timing, deadline);
+                rc = sata_link_resume(link, timing, deadline);
                 /* whine about phy resume failure but proceed */
                 if (rc && rc != -EOPNOTSUPP)
                         ata_port_printk(ap, KERN_WARNING, "failed to resume "
@@ -3347,7 +3349,7 @@ int ata_std_prereset(struct ata_port *ap, unsigned long deadline)
         /* Wait for !BSY if the controller can wait for the first D2H
          * Reg FIS and we don't know that no device is attached.
          */
-        if (!(ap->flags & ATA_FLAG_SKIP_D2H_BSY) && !ata_port_offline(ap)) {
+        if (!(ap->flags & ATA_FLAG_SKIP_D2H_BSY) && !ata_link_offline(link)) {
                 rc = ata_wait_ready(ap, deadline);
                 if (rc && rc != -ENODEV) {
                         ata_port_printk(ap, KERN_WARNING, "device not ready "
@@ -3376,6 +3378,7 @@ int ata_std_prereset(struct ata_port *ap, unsigned long deadline)
 int ata_std_softreset(struct ata_port *ap, unsigned int *classes,
                       unsigned long deadline)
 {
+        struct ata_link *link = &ap->link;
         unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
         unsigned int devmask = 0;
         int rc;
@@ -3383,7 +3386,7 @@ int ata_std_softreset(struct ata_port *ap, unsigned int *classes,
 
         DPRINTK("ENTER\n");
 
-        if (ata_port_offline(ap)) {
+        if (ata_link_offline(link)) {
                 classes[0] = ATA_DEV_NONE;
                 goto out;
         }
@@ -3401,7 +3404,7 @@ int ata_std_softreset(struct ata_port *ap, unsigned int *classes,
         DPRINTK("about to softreset, devmask=%x\n", devmask);
         rc = ata_bus_softreset(ap, devmask, deadline);
         /* if link is occupied, -ENODEV too is an error */
-        if (rc && (rc != -ENODEV || sata_scr_valid(ap))) {
+        if (rc && (rc != -ENODEV || sata_scr_valid(link))) {
                 ata_port_printk(ap, KERN_ERR, "SRST failed (errno=%d)\n", rc);
                 return rc;
         }
@@ -3433,35 +3436,36 @@ int ata_std_softreset(struct ata_port *ap, unsigned int *classes,
 int sata_port_hardreset(struct ata_port *ap, const unsigned long *timing,
                         unsigned long deadline)
 {
+        struct ata_link *link = &ap->link;
         u32 scontrol;
         int rc;
 
         DPRINTK("ENTER\n");
 
-        if (sata_set_spd_needed(ap)) {
+        if (sata_set_spd_needed(link)) {
                 /* SATA spec says nothing about how to reconfigure
                  * spd.  To be on the safe side, turn off phy during
                  * reconfiguration.  This works for at least ICH7 AHCI
                  * and Sil3124.
                  */
-                if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
+                if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
                         goto out;
 
                 scontrol = (scontrol & 0x0f0) | 0x304;
 
-                if ((rc = sata_scr_write(ap, SCR_CONTROL, scontrol)))
+                if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
                         goto out;
 
-                sata_set_spd(ap);
+                sata_set_spd(link);
         }
 
         /* issue phy wake/reset */
-        if ((rc = sata_scr_read(ap, SCR_CONTROL, &scontrol)))
+        if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
                 goto out;
 
         scontrol = (scontrol & 0x0f0) | 0x301;
 
-        if ((rc = sata_scr_write_flush(ap, SCR_CONTROL, scontrol)))
+        if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
                 goto out;
 
         /* Couldn't find anything in SATA I/II specs, but AHCI-1.1
@@ -3469,8 +3473,8 @@ int sata_port_hardreset(struct ata_port *ap, const unsigned long *timing,
          */
         msleep(1);
 
-        /* bring phy back */
-        rc = sata_phy_resume(ap, timing, deadline);
+        /* bring link back */
+        rc = sata_link_resume(link, timing, deadline);
  out:
         DPRINTK("EXIT, rc=%d\n", rc);
         return rc;
@@ -3494,7 +3498,8 @@ int sata_port_hardreset(struct ata_port *ap, const unsigned long *timing,
 int sata_std_hardreset(struct ata_port *ap, unsigned int *class,
                        unsigned long deadline)
 {
-        const unsigned long *timing = sata_ehc_deb_timing(&ap->link.eh_context);
+        struct ata_link *link = &ap->link;
+        const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
         int rc;
 
         DPRINTK("ENTER\n");
@@ -3508,7 +3513,7 @@ int sata_std_hardreset(struct ata_port *ap, unsigned int *class,
         }
 
         /* TODO: phy layer with polling, timeouts, etc. */
-        if (ata_port_offline(ap)) {
+        if (ata_link_offline(link)) {
                 *class = ATA_DEV_NONE;
                 DPRINTK("EXIT, link offline\n");
                 return 0;
@@ -3547,16 +3552,17 @@ int sata_std_hardreset(struct ata_port *ap, unsigned int *class,
  */
 void ata_std_postreset(struct ata_port *ap, unsigned int *classes)
 {
+        struct ata_link *link = &ap->link;
         u32 serror;
 
         DPRINTK("ENTER\n");
 
         /* print link status */
-        sata_print_link_status(ap);
+        sata_print_link_status(link);
 
         /* clear SError */
-        if (sata_scr_read(ap, SCR_ERROR, &serror) == 0)
-                sata_scr_write(ap, SCR_ERROR, serror);
+        if (sata_scr_read(link, SCR_ERROR, &serror) == 0)
+                sata_scr_write(link, SCR_ERROR, serror);
 
         /* is double-select really necessary? */
         if (classes[0] != ATA_DEV_NONE)
@@ -5729,9 +5735,9 @@ irqreturn_t ata_interrupt (int irq, void *dev_instance)
 
 /**
  *      sata_scr_valid - test whether SCRs are accessible
- *      @ap: ATA port to test SCR accessibility for
+ *      @link: ATA link to test SCR accessibility for
  *
- *      Test whether SCRs are accessible for @ap.
+ *      Test whether SCRs are accessible for @link.
  *
  *      LOCKING:
  *      None.
@@ -5739,18 +5745,20 @@ irqreturn_t ata_interrupt (int irq, void *dev_instance)
  *      RETURNS:
  *      1 if SCRs are accessible, 0 otherwise.
  */
-int sata_scr_valid(struct ata_port *ap)
+int sata_scr_valid(struct ata_link *link)
 {
+        struct ata_port *ap = link->ap;
+
         return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
 }
 
 /**
  *      sata_scr_read - read SCR register of the specified port
- *      @ap: ATA port to read SCR for
+ *      @link: ATA link to read SCR for
  *      @reg: SCR to read
  *      @val: Place to store read value
  *
- *      Read SCR register @reg of @ap into *@val.  This function is
+ *      Read SCR register @reg of @link into *@val.  This function is
  *      guaranteed to succeed if the cable type of the port is SATA
  *      and the port implements ->scr_read.
  *
@@ -5760,20 +5768,22 @@ int sata_scr_valid(struct ata_port *ap)
  *      RETURNS:
  *      0 on success, negative errno on failure.
  */
-int sata_scr_read(struct ata_port *ap, int reg, u32 *val)
+int sata_scr_read(struct ata_link *link, int reg, u32 *val)
 {
-        if (sata_scr_valid(ap))
+        struct ata_port *ap = link->ap;
+
+        if (sata_scr_valid(link))
                 return ap->ops->scr_read(ap, reg, val);
         return -EOPNOTSUPP;
 }
 
 /**
  *      sata_scr_write - write SCR register of the specified port
- *      @ap: ATA port to write SCR for
+ *      @link: ATA link to write SCR for
  *      @reg: SCR to write
  *      @val: value to write
  *
- *      Write @val to SCR register @reg of @ap.  This function is
+ *      Write @val to SCR register @reg of @link.  This function is
  *      guaranteed to succeed if the cable type of the port is SATA
  *      and the port implements ->scr_read.
  *
@@ -5783,16 +5793,18 @@ int sata_scr_read(struct ata_port *ap, int reg, u32 *val)
  *      RETURNS:
  *      0 on success, negative errno on failure.
  */
-int sata_scr_write(struct ata_port *ap, int reg, u32 val)
+int sata_scr_write(struct ata_link *link, int reg, u32 val)
 {
-        if (sata_scr_valid(ap))
+        struct ata_port *ap = link->ap;
+
+        if (sata_scr_valid(link))
                 return ap->ops->scr_write(ap, reg, val);
         return -EOPNOTSUPP;
 }
 
 /**
  *      sata_scr_write_flush - write SCR register of the specified port and flush
- *      @ap: ATA port to write SCR for
+ *      @link: ATA link to write SCR for
  *      @reg: SCR to write
  *      @val: value to write
  *
@@ -5805,11 +5817,12 @@ int sata_scr_write(struct ata_port *ap, int reg, u32 val)
  *      RETURNS:
  *      0 on success, negative errno on failure.
  */
-int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val)
+int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
 {
+        struct ata_port *ap = link->ap;
         int rc;
 
-        if (sata_scr_valid(ap)) {
+        if (sata_scr_valid(link)) {
                 rc = ap->ops->scr_write(ap, reg, val);
                 if (rc == 0)
                         rc = ap->ops->scr_read(ap, reg, &val);
@@ -5819,12 +5832,12 @@ int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val)
 }
 
 /**
- *      ata_port_online - test whether the given port is online
- *      @ap: ATA port to test
+ *      ata_link_online - test whether the given link is online
+ *      @link: ATA link to test
  *
- *      Test whether @ap is online.  Note that this function returns 0
- *      if online status of @ap cannot be obtained, so
- *      ata_port_online(ap) != !ata_port_offline(ap).
+ *      Test whether @link is online.  Note that this function returns
+ *      0 if online status of @link cannot be obtained, so
+ *      ata_link_online(link) != !ata_link_offline(link).
  *
  *      LOCKING:
  *      None.
@@ -5832,22 +5845,23 @@ int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val)
  *      RETURNS:
  *      1 if the port online status is available and online.
  */
-int ata_port_online(struct ata_port *ap)
+int ata_link_online(struct ata_link *link)
 {
         u32 sstatus;
 
-        if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) == 0x3)
+        if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
+            (sstatus & 0xf) == 0x3)
                 return 1;
         return 0;
 }
 
 /**
- *      ata_port_offline - test whether the given port is offline
- *      @ap: ATA port to test
+ *      ata_link_offline - test whether the given link is offline
+ *      @link: ATA link to test
  *
- *      Test whether @ap is offline.  Note that this function returns
- *      0 if offline status of @ap cannot be obtained, so
- *      ata_port_online(ap) != !ata_port_offline(ap).
+ *      Test whether @link is offline.  Note that this function
+ *      returns 0 if offline status of @link cannot be obtained, so
+ *      ata_link_online(link) != !ata_link_offline(link).
  *
  *      LOCKING:
  *      None.
@@ -5855,11 +5869,12 @@ int ata_port_online(struct ata_port *ap)
  *      RETURNS:
  *      1 if the port offline status is available and offline.
  */
-int ata_port_offline(struct ata_port *ap)
+int ata_link_offline(struct ata_link *link)
 {
         u32 sstatus;
 
-        if (!sata_scr_read(ap, SCR_STATUS, &sstatus) && (sstatus & 0xf) != 0x3)
+        if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
+            (sstatus & 0xf) != 0x3)
                 return 1;
         return 0;
 }
@@ -6397,7 +6412,7 @@ int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
                         ap->cbl = ATA_CBL_SATA;
 
                 /* init sata_spd_limit to the current value */
-                if (sata_scr_read(ap, SCR_CONTROL, &scontrol) == 0) {
+                if (sata_scr_read(&ap->link, SCR_CONTROL, &scontrol) == 0) {
                         int spd = (scontrol >> 4) & 0xf;
                         if (spd)
                                 ap->link.hw_sata_spd_limit &= (1 << spd) - 1;
@@ -6924,8 +6939,8 @@ EXPORT_SYMBOL_GPL(ata_bmdma_post_internal_cmd);
 EXPORT_SYMBOL_GPL(ata_port_probe);
 EXPORT_SYMBOL_GPL(ata_dev_disable);
 EXPORT_SYMBOL_GPL(sata_set_spd);
-EXPORT_SYMBOL_GPL(sata_phy_debounce);
-EXPORT_SYMBOL_GPL(sata_phy_resume);
+EXPORT_SYMBOL_GPL(sata_link_debounce);
+EXPORT_SYMBOL_GPL(sata_link_resume);
 EXPORT_SYMBOL_GPL(sata_phy_reset);
 EXPORT_SYMBOL_GPL(__sata_phy_reset);
 EXPORT_SYMBOL_GPL(ata_bus_reset);
@@ -6952,8 +6967,8 @@ EXPORT_SYMBOL_GPL(sata_scr_valid);
 EXPORT_SYMBOL_GPL(sata_scr_read);
 EXPORT_SYMBOL_GPL(sata_scr_write);
 EXPORT_SYMBOL_GPL(sata_scr_write_flush);
-EXPORT_SYMBOL_GPL(ata_port_online);
-EXPORT_SYMBOL_GPL(ata_port_offline);
+EXPORT_SYMBOL_GPL(ata_link_online);
+EXPORT_SYMBOL_GPL(ata_link_offline);
 #ifdef CONFIG_PM
 EXPORT_SYMBOL_GPL(ata_host_suspend);
 EXPORT_SYMBOL_GPL(ata_host_resume);
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 8c37ec0bbf6c..48ca68b3979b 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -1501,7 +1501,7 @@ static unsigned int ata_eh_speed_down(struct ata_device *dev, int is_io,
         /* speed down? */
         if (verdict & ATA_EH_SPDN_SPEED_DOWN) {
                 /* speed down SATA link speed if possible */
-                if (sata_down_spd_limit(dev->link->ap) == 0) {
+                if (sata_down_spd_limit(dev->link) == 0) {
                         action |= ATA_EH_HARDRESET;
                         goto done;
                 }
@@ -1561,7 +1561,8 @@ static unsigned int ata_eh_speed_down(struct ata_device *dev, int is_io,
  */
 static void ata_eh_autopsy(struct ata_port *ap)
 {
-        struct ata_eh_context *ehc = &ap->link.eh_context;
+        struct ata_link *link = &ap->link;
+        struct ata_eh_context *ehc = &link->eh_context;
         unsigned int all_err_mask = 0;
         int tag, is_io = 0;
         u32 serror;
@@ -1573,7 +1574,7 @@ static void ata_eh_autopsy(struct ata_port *ap)
                 return;
 
         /* obtain and analyze SError */
-        rc = sata_scr_read(ap, SCR_ERROR, &serror);
+        rc = sata_scr_read(link, SCR_ERROR, &serror);
         if (rc == 0) {
                 ehc->i.serror |= serror;
                 ata_eh_analyze_serror(ap);
@@ -1782,7 +1783,8 @@ static int ata_eh_reset(struct ata_port *ap, int classify,
                         ata_prereset_fn_t prereset, ata_reset_fn_t softreset,
                         ata_reset_fn_t hardreset, ata_postreset_fn_t postreset)
 {
-        struct ata_eh_context *ehc = &ap->link.eh_context;
+        struct ata_link *link = &ap->link;
+        struct ata_eh_context *ehc = &link->eh_context;
         unsigned int *classes = ehc->classes;
         int verbose = !(ehc->i.flags & ATA_EHI_QUIET);
         int try = 0;
@@ -1800,7 +1802,7 @@ static int ata_eh_reset(struct ata_port *ap, int classify,
          */
         action = ehc->i.action;
         ehc->i.action &= ~ATA_EH_RESET_MASK;
-        if (softreset && (!hardreset || (!sata_set_spd_needed(ap) &&
+        if (softreset && (!hardreset || (!sata_set_spd_needed(link) &&
                                          !(action & ATA_EH_HARDRESET))))
                 ehc->i.action |= ATA_EH_SOFTRESET;
         else
@@ -1814,7 +1816,7 @@ static int ata_eh_reset(struct ata_port *ap, int classify,
                                                 "port disabled. ignoring.\n");
                                 ehc->i.action &= ~ATA_EH_RESET_MASK;
 
-                                ata_link_for_each_dev(dev, &ap->link)
+                                ata_link_for_each_dev(dev, link)
                                         classes[dev->devno] = ATA_DEV_NONE;
 
                                 rc = 0;
@@ -1832,7 +1834,7 @@ static int ata_eh_reset(struct ata_port *ap, int classify,
                 reset = softreset;
         else {
                 /* prereset told us not to reset, bang classes and return */
-                ata_link_for_each_dev(dev, &ap->link)
+                ata_link_for_each_dev(dev, link)
                         classes[dev->devno] = ATA_DEV_NONE;
                 rc = 0;
                 goto out;
@@ -1902,7 +1904,7 @@ static int ata_eh_reset(struct ata_port *ap, int classify,
 
                 if (rc == -EPIPE ||
                     try == ARRAY_SIZE(ata_eh_reset_timeouts) - 1)
-                        sata_down_spd_limit(ap);
+                        sata_down_spd_limit(link);
                 if (hardreset)
                         reset = hardreset;
                 goto retry;
@@ -1914,12 +1916,12 @@ static int ata_eh_reset(struct ata_port *ap, int classify,
                 /* After the reset, the device state is PIO 0 and the
                  * controller state is undefined.  Record the mode.
                  */
-                ata_link_for_each_dev(dev, &ap->link)
+                ata_link_for_each_dev(dev, link)
                         dev->pio_mode = XFER_PIO_0;
 
                 /* record current link speed */
-                if (sata_scr_read(ap, SCR_STATUS, &sstatus) == 0)
-                        ap->link.sata_spd = (sstatus >> 4) & 0xf;
+                if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0)
+                        link->sata_spd = (sstatus >> 4) & 0xf;
 
                 if (postreset)
                         postreset(ap, classes);
@@ -1957,7 +1959,7 @@ static int ata_eh_revalidate_and_attach(struct ata_port *ap,
                         readid_flags |= ATA_READID_POSTRESET;
 
                 if ((action & ATA_EH_REVALIDATE) && ata_dev_enabled(dev)) {
-                        if (ata_port_offline(ap)) {
+                        if (ata_link_offline(&ap->link)) {
                                 rc = -EIO;
                                 goto err;
                         }
@@ -2079,7 +2081,6 @@ static int ata_eh_skip_recovery(struct ata_port *ap)
 
 static void ata_eh_handle_dev_fail(struct ata_device *dev, int err)
 {
-        struct ata_port *ap = dev->link->ap;
         struct ata_eh_context *ehc = &dev->link->eh_context;
 
         ehc->tries[dev->devno]--;
@@ -2096,7 +2097,7 @@ static void ata_eh_handle_dev_fail(struct ata_device *dev, int err)
                         /* This is the last chance, better to slow
                          * down than lose it.
                          */
-                        sata_down_spd_limit(ap);
+                        sata_down_spd_limit(dev->link);
                         ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
                 }
         }
@@ -2106,7 +2107,7 @@ static void ata_eh_handle_dev_fail(struct ata_device *dev, int err)
                 ata_dev_disable(dev);
 
                 /* detach if offline */
-                if (ata_port_offline(ap))
+                if (ata_link_offline(dev->link))
                         ata_eh_detach_dev(dev);
 
                 /* probe if requested */
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 2100cd61ed69..dd528dbd9ccf 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -500,7 +500,7 @@ void ata_bmdma_error_handler(struct ata_port *ap)
         ata_reset_fn_t hardreset;
 
         hardreset = NULL;
-        if (sata_scr_valid(ap))
+        if (sata_scr_valid(&ap->link))
                 hardreset = sata_std_hardreset;
 
         ata_bmdma_drive_eh(ap, ata_std_prereset, ata_std_softreset, hardreset,
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 564cd234c805..700843a9f30a 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -78,8 +78,8 @@ extern int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
 extern int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags);
 extern int ata_dev_revalidate(struct ata_device *dev, unsigned int readid_flags);
 extern int ata_dev_configure(struct ata_device *dev);
-extern int sata_down_spd_limit(struct ata_port *ap);
-extern int sata_set_spd_needed(struct ata_port *ap);
+extern int sata_down_spd_limit(struct ata_link *link);
+extern int sata_set_spd_needed(struct ata_link *link);
 extern int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel);
 extern int ata_set_mode(struct ata_port *ap, struct ata_device **r_failed_dev);
 extern void ata_sg_clean(struct ata_queued_cmd *qc);
diff --git a/drivers/ata/pata_scc.c b/drivers/ata/pata_scc.c
index aab068fbb7bc..63fe99a10cd1 100644
--- a/drivers/ata/pata_scc.c
+++ b/drivers/ata/pata_scc.c
@@ -612,7 +612,7 @@ static int scc_std_softreset (struct ata_port *ap, unsigned int *classes,
 
         DPRINTK("ENTER\n");
 
-        if (ata_port_offline(ap)) {
+        if (ata_link_offline(&ap->link)) {
                 classes[0] = ATA_DEV_NONE;
                 goto out;
         }
diff --git a/drivers/ata/sata_inic162x.c b/drivers/ata/sata_inic162x.c
index 3c0ef7a2f2fe..f2b1bea934bc 100644
--- a/drivers/ata/sata_inic162x.c
+++ b/drivers/ata/sata_inic162x.c
@@ -435,7 +435,7 @@ static int inic_hardreset(struct ata_port *ap, unsigned int *class,
         msleep(1);
         writew(val & ~IDMA_CTL_RST_ATA, idma_ctl);
 
-        rc = sata_phy_resume(ap, timing, deadline);
+        rc = sata_link_resume(&ap->link, timing, deadline);
         if (rc) {
                 ata_port_printk(ap, KERN_WARNING, "failed to resume "
                                 "link after reset (errno=%d)\n", rc);
@@ -443,7 +443,7 @@ static int inic_hardreset(struct ata_port *ap, unsigned int *class,
         }
 
         *class = ATA_DEV_NONE;
-        if (ata_port_online(ap)) {
+        if (ata_link_online(&ap->link)) {
                 struct ata_taskfile tf;
 
                 /* wait a while before checking status */
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index 246e7c5fdce8..8e63c60adaff 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -1423,8 +1423,8 @@ static void mv_err_intr(struct ata_port *ap, struct ata_queued_cmd *qc)
                 /* just a guess: do we need to do this? should we
                  * expand this, and do it in all cases?
                  */
-                sata_scr_read(ap, SCR_ERROR, &serr);
-                sata_scr_write_flush(ap, SCR_ERROR, serr);
+                sata_scr_read(&ap->link, SCR_ERROR, &serr);
+                sata_scr_write_flush(&ap->link, SCR_ERROR, serr);
         }
 
         edma_err_cause = readl(port_mmio + EDMA_ERR_IRQ_CAUSE_OFS);
@@ -1468,8 +1468,8 @@ static void mv_err_intr(struct ata_port *ap, struct ata_queued_cmd *qc)
                 }
 
                 if (edma_err_cause & EDMA_ERR_SERR) {
-                        sata_scr_read(ap, SCR_ERROR, &serr);
-                        sata_scr_write_flush(ap, SCR_ERROR, serr);
+                        sata_scr_read(&ap->link, SCR_ERROR, &serr);
+                        sata_scr_write_flush(&ap->link, SCR_ERROR, serr);
                         err_mask = AC_ERR_ATA_BUS;
                         action |= ATA_EH_HARDRESET;
                 }
@@ -1687,7 +1687,7 @@ static void mv_pci_error(struct ata_host *host, void __iomem *mmio)
 
         for (i = 0; i < host->n_ports; i++) {
                 ap = host->ports[i];
-                if (!ata_port_offline(ap)) {
+                if (!ata_link_offline(&ap->link)) {
                         ehi = &ap->link.eh_info;
                         ata_ehi_clear_desc(ehi);
                         if (!printed++)
@@ -2198,14 +2198,14 @@ static void mv_phy_reset(struct ata_port *ap, unsigned int *class,
 
         /* Issue COMRESET via SControl */
 comreset_retry:
-        sata_scr_write_flush(ap, SCR_CONTROL, 0x301);
+        sata_scr_write_flush(&ap->link, SCR_CONTROL, 0x301);
         msleep(1);
 
-        sata_scr_write_flush(ap, SCR_CONTROL, 0x300);
+        sata_scr_write_flush(&ap->link, SCR_CONTROL, 0x300);
         msleep(20);
 
         do {
-                sata_scr_read(ap, SCR_STATUS, &sstatus);
+                sata_scr_read(&ap->link, SCR_STATUS, &sstatus);
                 if (((sstatus & 0x3) == 3) || ((sstatus & 0x3) == 0))
                         break;
 
@@ -2230,7 +2230,7 @@ comreset_retry:
         }
 #endif
 
-        if (ata_port_offline(ap)) {
+        if (ata_link_offline(&ap->link)) {
                 *class = ATA_DEV_NONE;
                 return;
         }
@@ -2285,7 +2285,7 @@ static int mv_prereset(struct ata_port *ap, unsigned long deadline)
         if (ehc->i.action & ATA_EH_HARDRESET)
                 return 0;
 
-        if (ata_port_online(ap))
+        if (ata_link_online(&ap->link))
                 rc = ata_wait_ready(ap, deadline);
         else
                 rc = -ENODEV;
@@ -2313,11 +2313,11 @@ static void mv_postreset(struct ata_port *ap, unsigned int *classes)
         u32 serr;
 
         /* print link status */
-        sata_print_link_status(ap);
+        sata_print_link_status(&ap->link);
 
         /* clear SError */
-        sata_scr_read(ap, SCR_ERROR, &serr);
-        sata_scr_write_flush(ap, SCR_ERROR, serr);
+        sata_scr_read(&ap->link, SCR_ERROR, &serr);
+        sata_scr_write_flush(&ap->link, SCR_ERROR, serr);
 
         /* bail out if no device is present */
         if (classes[0] == ATA_DEV_NONE && classes[1] == ATA_DEV_NONE) {
diff --git a/drivers/ata/sata_promise.c b/drivers/ata/sata_promise.c
index 620d0675d18a..c7238ce83541 100644
--- a/drivers/ata/sata_promise.c
+++ b/drivers/ata/sata_promise.c
@@ -475,7 +475,7 @@ static void pdc_atapi_pkt(struct ata_queued_cmd *qc)
         buf32[2] = 0;                           /* no next-packet */
 
         /* select drive */
-        if (sata_scr_valid(ap)) {
+        if (sata_scr_valid(&ap->link)) {
                 dev_sel = PDC_DEVICE_SATA;
         } else {
                 dev_sel = ATA_DEVICE_OBS;
@@ -643,7 +643,7 @@ static void pdc_error_intr(struct ata_port *ap, struct ata_queued_cmd *qc,
                            | PDC_PCI_SYS_ERR | PDC1_PCI_PARITY_ERR))
                 ac_err_mask |= AC_ERR_HOST_BUS;
 
-        if (sata_scr_valid(ap)) {
+        if (sata_scr_valid(&ap->link)) {
                 u32 serror;
 
                 pdc_sata_scr_read(ap, SCR_ERROR, &serror);
diff --git a/drivers/ata/sata_sil24.c b/drivers/ata/sata_sil24.c
index 2d8334e7921d..0cd40d5215fe 100644
--- a/drivers/ata/sata_sil24.c
+++ b/drivers/ata/sata_sil24.c
@@ -593,7 +593,7 @@ static int sil24_do_softreset(struct ata_port *ap, unsigned int *class,
 
         DPRINTK("ENTER\n");
 
-        if (ata_port_offline(ap)) {
+        if (ata_link_offline(&ap->link)) {
                 DPRINTK("PHY reports no device\n");
                 *class = ATA_DEV_NONE;
                 goto out;
@@ -650,10 +650,10 @@ static int sil24_hardreset(struct ata_port *ap, unsigned int *class,
         u32 tmp;
 
         /* sil24 does the right thing(tm) without any protection */
-        sata_set_spd(ap);
+        sata_set_spd(&ap->link);
 
         tout_msec = 100;
-        if (ata_port_online(ap))
+        if (ata_link_online(&ap->link))
                 tout_msec = 5000;
 
         writel(PORT_CS_DEV_RST, port + PORT_CTRL_STAT);
@@ -663,14 +663,14 @@ static int sil24_hardreset(struct ata_port *ap, unsigned int *class,
         /* SStatus oscillates between zero and valid status after
          * DEV_RST, debounce it.
          */
-        rc = sata_phy_debounce(ap, sata_deb_timing_long, deadline);
+        rc = sata_link_debounce(&ap->link, sata_deb_timing_long, deadline);
         if (rc) {
                 reason = "PHY debouncing failed";
                 goto err;
         }
 
         if (tmp & PORT_CS_DEV_RST) {
-                if (ata_port_offline(ap))
+                if (ata_link_offline(&ap->link))
                         return 0;
                 reason = "link not ready";
                 goto err;
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 62fa8cf677a1..e7882ba63e78 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -696,16 +696,16 @@ static inline int ata_port_is_dummy(struct ata_port *ap)
         return ap->ops == &ata_dummy_port_ops;
 }
 
-extern void sata_print_link_status(struct ata_port *ap);
+extern void sata_print_link_status(struct ata_link *link);
 extern void ata_port_probe(struct ata_port *);
 extern void __sata_phy_reset(struct ata_port *ap);
 extern void sata_phy_reset(struct ata_port *ap);
 extern void ata_bus_reset(struct ata_port *ap);
-extern int sata_set_spd(struct ata_port *ap);
-extern int sata_phy_debounce(struct ata_port *ap, const unsigned long *param,
-                             unsigned long deadline);
-extern int sata_phy_resume(struct ata_port *ap, const unsigned long *param,
-                           unsigned long deadline);
+extern int sata_set_spd(struct ata_link *link);
+extern int sata_link_debounce(struct ata_link *link,
+                        const unsigned long *params, unsigned long deadline);
+extern int sata_link_resume(struct ata_link *link, const unsigned long *params,
+                            unsigned long deadline);
 extern int ata_std_prereset(struct ata_port *ap, unsigned long deadline);
 extern int ata_std_softreset(struct ata_port *ap, unsigned int *classes,
                              unsigned long deadline);
@@ -753,12 +753,12 @@ extern int ata_sas_slave_configure(struct scsi_device *, struct ata_port *);
 extern int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
                             struct ata_port *ap);
 extern unsigned int ata_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc);
-extern int sata_scr_valid(struct ata_port *ap);
-extern int sata_scr_read(struct ata_port *ap, int reg, u32 *val);
-extern int sata_scr_write(struct ata_port *ap, int reg, u32 val);
-extern int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val);
-extern int ata_port_online(struct ata_port *ap);
-extern int ata_port_offline(struct ata_port *ap);
+extern int sata_scr_valid(struct ata_link *link);
+extern int sata_scr_read(struct ata_link *link, int reg, u32 *val);
+extern int sata_scr_write(struct ata_link *link, int reg, u32 val);
+extern int sata_scr_write_flush(struct ata_link *link, int reg, u32 val);
+extern int ata_link_online(struct ata_link *link);
+extern int ata_link_offline(struct ata_link *link);
 #ifdef CONFIG_PM
 extern int ata_host_suspend(struct ata_host *host, pm_message_t mesg);
 extern void ata_host_resume(struct ata_host *host);